Understanding Bore Scoring in Al-Si Cylinder Systems — Charles Navarro / PAGE 16
DLC Coating - Class of amorphous carbon material that displays some of the typical properties of · diamond that when applied to su
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DLC Coating - Class of amorphous carbon material that displays some of the typical properties of
diamond that when applied to surfaces, reduces wear and lowers friction between surfaces.
ESP - Emission System Protection, typically referring to a low ash or ash-less lubricating oil designed to
extend emissions system component life.
Eutectic Aluminum - A eutectic alloy has a lower melting point than any of its components. Al-Si alloys
become eutectic at 11.7% silicon content.
EV - Electric Vehicle
Expansion Rate - The coefficient of linear thermal expansion is the ratio change in length per degree
temperature to length.
Ferral Cylinder - Prior to hard chrome, Porsche used splatter-coated iron on its aluminum cylinders that
once honed, would provide a good wear surface for pistons and rings to ride on with improved thermal
conductivity over a solid cast iron cylinder.
Ferrocoat – KS iron-coated piston skirts.
Ferroprint - A environmentally friendly alternative to the Mahle Ferrostan/FerroTec® providing a stainless
steel particle reinforced synthetic resin coating to prevent wear between Al-Si cylinder liners and piston
skirts to a thickness of 20 um.
Ferrostan - Also known as Ferrotec, this coating is for applications with an aluminum bore, an iron coating is
required to prevent high wear and seizing. It is applied 10-13 um thick and can be topped with a thin
layer of tin for run-in protection.
Galling - A form of mechanical wear caused by adhesion between sliding surfaces.
GCI - Gasoline Compression Ignition relies on compression, rather than spark ignition, to ignite the intake
charge, similar to a diesel engine.
GDI - Gasoline Direct Injection delivers fuel directly into the combustion chamber, like a diesel engine, at
several thousand PSI of pressure, allowing for higher compression ratios, more accurate fuel delivery, and
increased engine efficiency.
GF-6 - ILSAC GF-6 focuses on turbocharged-engine specific standards including addressing issues with
LSPI, or low speed pre-ignition. GF-6A covers oil viscosities 5w30 and higher where GF-6B is for
viscosities 0w16 and lighter for increased fuel economy. GF-6 also brings engine durability testing and
start/stop protection.
GPF - Gasoline Particulate Filters are used in engines with gasoline direct injection to capture soot particles
created during operation at high fuel pressures and compression ratios, similar to soot generated by diesel
engines.
Hardness - A measure of resistance to localized plastic deformation.
HC Emissions - High hydrocarbon emissions (HC) reflects unspent fuel in the exhaust.
Heterogeneous Casting - Aluminum engine blocks cast with cylinder liners or cylinder liner inserts.
Honing - An abrasive machining process that produces the functional surface finish for cylinder bores.
Typical parameters are cross-hatch angle and surface finish.
Hybrid - Hybrid drivetrains come in several types: mild, full (sometimes referred to as strong), and plug-in
varieties. Hybrid drivetrains combine an internal combustion engine with batteries and an electric motor.
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